Fix typo (#82)

Author: joliss

src/content/docs/configuration/key-binding.mdx

@@ -90,7 +90,7 @@ used in combination with the config
 
 ## bash
 
-Atuin provides a bindable shell function "`_atuin_history`" for keybindings in
+Atuin provides a bindable shell function "`__atuin_history`" for keybindings in
 Bash.  The flag `--shell-up-key-binding` can be optionally specified to the
 first argument for keybindings to the <kbd>up</kbd> key or similar keys.